Nadanusandhan According to HathYoga Pradipika Nadanusandhan means research of sound. In the fourth chapter of Hatha Yoga Pradipika, Swami Swatmaram ji has described the practice of Nadanusandhan. There are two types of Naads- Aahata Naad and Anahata Naad. Aahata Naad like- are popular like Tabla, Sarangi, Harmonium, Dholak, Manjira, Veena etc., which are played by blowing. These are useful for music. Anahata Naad is that which the seeker has to hear from within in his spiritual practice. For these, one should first try to concentrate on the gross and gradually leaving the gross and meditating on the subtle. This concentration is what gives the state of samadhi. When rhythm of the mind, the work of nadanusandhan of is completed. First of all, different types of sounds are heard. As the practice becomes firm, subtler and more subtle sounds begin to be heard. First Sea, Cloud, Waterfall etc. In the middle the soft sound of Bheri etc. and in the end the sound of Kinkini, Flute, Veena,